Will I be sinful for failing to convince my dad of his haram wealth, and benefiting from it?

I personally think that income earned by a barber is haram if it includes beard shaves and the like, but my father believes that it's completely halal. Will I earn any sin for eating from his money earned from the barbershop? I'm still a teenager. I don't earn my own money yet. Will I be sinful for consuming his haram wealth? I feel guilty for not being able to convince him of this